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SSC-JE’21 CE: Daily Practices Quiz. 15-July-2021

Quiz: Civil Engineering
Exam: SSC-JE
Topic: Miscellaneous

Each question carries 1 mark
Negative marking: 1/4 mark
Time: 8 Minutes

Q1. As per IS specifications, the nominal concrete cover for moderate exposure should not be less than…………..
(a) 20 mm
(b) 30 mm
(c) 45 mm
(d) 50 mm

Q2. According to Reyve’s formula for estimating floods, the peak discharge is proportional to
(a) A
(b) A^(2/3)
(c) A^(3/4)
(d) A^(1/2)

Q3. If a retention of 0.75 meter is obtained from a tachometer on a vertical staff, then the horizontal distance between the tacheometer and staff station is?
(a) 75 m
(b) 25 m
(c) 7.5 m
(d) 50 m

Q4. If the velocity of pressure wave generated is 2m/s, the value of critical time is:
(a) 2 s
(b) 4 s
(c) 1 s
(d) 0.5s

Q5. Which of the following Bogue’s compounds of cement liberates maximum heat of hydration?
(a) C_3 S
(b) C_4 AF
(c) C_3 A
(d) C_2 S

Q6. Find the plinth area of building if a building has built up area of 250 m.² with a courtyard of 5 m × 6 m inside the building.
(a) 223 m.²
(b) 222 m.²
(c) 221 m.²
(d) 220 m.²

Solutions

S1. Ans.(b)

Sol.

Exposure condition Minimum grade Minimum cover
Mild M20 20mm
Moderate M25 30mm
Sever M30 45mm
Very sever M35 50mm
Extreme M40 75mm

S2. Ans.(b)
Sol. Peak flood discharge by Reyve’s formula-
Q=CA^(2/3)
A= area in km²
Q= Peak flood discharge (m^3/sec)
C= constant
Reyve’s formula is used for southern India catchments.

S3. Ans.(a)
Sol. Staff intercept (S) = 0.75 meter
▭(D=kS+C)
Multiplying constant (k) = 100
Additive constant (c) = 0
D= 100×0.75+0
▭(D=75 m)

S4. Ans.(c)
Sol. Velocity of Pressure wave (C) = 2m/sec
Assume unit length of pipe
Critical time (t_c) = 2L/C = (2×1)/2 = 1 sec

S5. Ans.(c)
Sol. Decreasing order of Heat of Hydration.
▭(C_3 A>C_3 S>C_4 AF>C_2 S)
Decreasing order of rate of Hydration.
▭(C_4 AF>C_3 A>C_3 S>C_2 S)

S6. Ans.(d)
Sol. Given, built up area = 250 m²
Courtyard area = 5m × 6m = 30 m²
Note → plinth area does not include the courtyard area.
Hence, plinth area = built up area – courtyard area
= (250 – 30) m²
= 220 m²

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